<template>
    <!-- upload -->
    <div class="upload">
        <el-upload
                class="avatar-uploader"
                :action= domain
                :http-request = upqiniu
                :show-file-list="false"
                :before-upload="beforeUpload">
            <img v-if="imageUrl" :src="imageUrl" class="avatar">
            <i v-else class="el-icon-plus avatar-uploader-icon"></i>
        </el-upload>
    </div>
</template>
<script>
    export default {
        data () {
            return {
                imageUrl: '',
                token: {},
                // 七牛云的上传地址，根据自己所在地区选择，我这里是华南区
                domain: 'https://upload-z2.qiniup.com',
                // 这是七牛云空间的外链默认域名
                qiniuaddr: 'cdn.lvkun.top'
            }
        },
        methods: {
            // 上传文件到七牛云
            upqiniu (req) {
                console.log(req)
                const config = {
                    headers: {'Content-Type': 'multipart/form-data'}
                }
                let filetype = ''
                if (req.file.type === 'image/png') {
                    filetype = 'png'
                } else {
                    filetype = 'jpg'
                }
                // 重命名要上传的文件
                const keyname = 'lvkun' + new Date() + Math.floor(Math.random() * 100) + '.' + filetype
                // 从后端获取上传凭证token
                this.$http.get('/QiniuUpToken').then(res => {
                    console.log(res)
                    const formdata = new FormData()
                    formdata.append('file', req.file)
                    formdata.append('token', res.data.token)
                    formdata.append('key', res.data.imageUrl)
                    // 获取到凭证之后再将文件上传到七牛云空间
                    this.$http.post(this.domain, formdata, config).then(res => {
                        this.imageUrl = 'http://' + this.qiniuaddr + '/' + res.data.key;
                        console.log(this.imageUrl)
                    })
                })
            },
            // 验证文件合法性
            beforeUpload (file) {
                const isJPG = file.type === 'image/jpeg' || file.type === 'image/png'
                const isLt2M = file.size / 1024 / 1024 < 2
                if (!isJPG) {
                    this.$message.error('上传头像图片只能是 JPG 格式!')
                }
                if (!isLt2M) {
                    this.$message.error('上传头像图片大小不能超过 2MB!')
                }
                return isJPG && isLt2M
            }
        }
    }
</script>
<style scoped>
    .upload {
        width: 600px;
        margin: 0 auto;
    }
    .avatar-uploader .el-upload {
        border: 5px dashed #ca1717 !important;
        border-radius: 6px;
        cursor: pointer;
        position: relative;
        overflow: hidden;
    }
    .avatar-uploader .el-upload:hover {
        border-color: #409EFF;
    }
    .avatar-uploader-icon {
        font-size: 28px;
        color: #8c939d;
        width: 178px;
        height: 178px;
        line-height: 178px;
        text-align: center;
    }
    .avatar {
        width: 178px;
        height: 178px;
        display: block;
    }
</style>


